Just an FYI. Same thing is happening on my 2015 S-Works Tarmac that I bought this January. I find it way too early as well. I think the best thing you can do is to replace it with another brand. Not expensive enough to do anything else about it and there are way too many good options out there to worry too much.

I have a 2 year old. turbo cotton that has no cracking and it has been an amazingly durable tire, given the low Crr. The regular turbos were never great tires though and that is some serious cracking for a year old tire (though you don't know how long the tire have sat in inventory).

Just get a new pair of GP4000s and call it good.

How do you store them, in the sun, in a damp basement, in a room with electric heat?

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Side room, no direct light on ground floor, 7 feet from a steam radiator.